Comey's later and some would argue incendiary decision to publicly re-open the case just days before the election will also be reviewed, as will the possibility that "certain underlying investigative decisions were based on improper considerations".
The US Justice Department has said it would probe an Federal Bureau of Investigation decision to announce an inquiry into Mrs Hillary Clinton's e-mails shortly before the November presidential election, a move she has blamed as a factor in her defeat.
Mook still said that there was no actual change in the status, just Comey saying there might have been. Comey exonerated her once again in a letter to Congress on November 6, but the damage had been done, in Clinton's view.
The US Department of Justice is launching a review of how the FBI handled the inquiry into Hillary Clinton's private email server, and whether public disclosures of the investigation cost Clinton the presidential election, as many have claimed.
The probe will look into why FBI Director James Comey chose to make public comments about the Clinton email investigation, and also whether he and the Justice Department followed established protocols.
Clinton and her supporters have blamed that letter for her defeat, along with Russian meddling.
It's been a head-scratching few months for FBI Director James Comey.
The White House clarified Thursday that they did not have a hand in the decision to investigate the matter.
Comey has notably declined to talk about any possible investigations of Trump or his campaign, as recently as this week rebuffing requests from legislators to confirm that agents were looking into any such matters. Isn't that what the IG's office is for?
It's interesting that the IG would begin his investigation in early July with Comey's announcement that Clinton would not be prosecuted.
It's unknown if the inquiry will cover Bill Clinton's private meeting with Attorney General Loretta Lynch in her plane on an airport tarmac, but it should.